Remove method DeploySelectedNodes.get_nodes
Remove method DeploySelectedNodes.get_nodes

DeploySelectedNodes.get_nodes method is exactly the
same as get_nodes in its base class, BaseDeploySelectedNodes,
so let's remote it.

Change-Id: I95648fce99fe1d5a04ad1e61088be49048a80f84

stackforge/fuel-web,stackforge/fuel-web,stackforge/fuel-web